Lifting-jack



A. MoNALLY.

LIPTING JACK.

(No Model.)

. No; 306,505. Patented Oct. 14, 1884.

\A/iTHEEElEE Unirnn S ratus ATENT union.

AUSTIN. MUNALLY, OF CASCADE, IO\VA.

Ll FTING JACK.

SPECIFICATION forming part of Letters Patent No. 306,505, dated October14:, 1884.

Application filed August 1884.

T0 (LZZ whom it may concern:

3e it known that I. AUSTIN lliICNALLY, a citizen of the United States,residing at Gascade, in the county of Dubuque and State of Iowa, haveinvented certain new and useful Improvements in Lifting-Jacks; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

This invention relates to lifting-jacks intended for raising andlowering long rods, tubing, &C.

It consists in certain novel constructions and combinations, as will behereinafter more fully described and claimed.

In the drawings, Figure l is a side elevation. Fig. 2 is a front View;Fig. 3, a vertical longitudinal section of my machine.

In practice I prefer to use abase, A, whereon to mount the standard 13.This standard may be a single post or beam; but it is ,pret erablyformed of two bars, 13 B, and braced by struts 3" 13. A bracket, 0, isextended forward from the upper end of the standard, and has a roller,0, supported in its outer end, in rear of which the arms of the bracketare connected by a cross-pin, 0*, arranged a sufficient distance fromthe pulley to provide a guide-passage for the pipe. The lever Dispivoted near its forward end in a support, I), which is pivoted at itsupper end to the stand ard, so the said lever may be movedlongitudinally as well as turned on its pivot. A pulley, E, is pivotedeccentrically to the forward end of the lever, and is provided with aloop, F, the arms of which are also pivoted eccentrically to the pulleyand on the same side of the center of same as the connection with thelever. This loop is adapted to embrace the pipe or rod, which is passedbetween the loop and the pulley. \V hen in the position shown in Figs. 1and 2, if the outer end of the lever be depressed, the rod will befirmly grasped. between the pulley and the loop and be raised; but whenthe lever is elevated on its returnstroke the pulley will release therod and slide down thereon for a fresh hold, the said rod (X0 model.)

being held meanwhile by a suitable detent, as will be presentlydescribed.

The described operation is the one followed in raisingpipes, and forsuch purpose the lever might be pivoted directly to the standard; butthe swinging support Dis preferred, and becomes useful in lowering pipesor rods. In so doing the detent is released while the lever is loweringthe pipe, and caused to hold the pipe while the lever is returning for afresh hold. In Fig. 3, suppose the lever has been brought to theposition shown, in lowering the pipe the detent is now caused to graspthe pipe and the lever is returned for a fresh hold. To release thelever, the same is swung slightly forward, as indicated in dotted lines.This turns the pulley on its pivot and brings the shorter diameter ofsame between the pivot and cross-bar of the loop. This longitudinalmotion of the lever is accomplished by means of its swinging support.The lever may now be raised for a new hold to about a horizontalposition, when, by a longitudinal movement of thelever to the rear, itmay again be caused to bind the pipe, when, the detent being properlyreleased, the pipe or rod may be again lowered as far as the length ofthe lever will permit, when the operation may be repeated. I prefer touse the form of detent shown, and which I will now describe, because itis simple and cheap of construction, effective in use, and autoinaticalin its operation. This dctent consists of a pulley pivoted near its periphery in a swinging support, H, which is pivotally secured near itsupper end to the standard. The pulley has a radial arm, G, projectedoutward from it near its point of pivotal support, and a radial arm, G",projected from what might be called its upper side, and provided withweights g. The object of this red G' is to hold the pulley in theposition shown in dot-ted lines, Fig. 3, except when engaged with therod or being moved into such engagement in the operation presentlydescribed. The pulley is provided with a loop, I, similar to loop F, aswill be understood. A red or rods, I, are secured to this loop andextend down between rods a a, as shown in Figs. 2 and and have theirends bent at z. The object of these rods is to pre vent the detent frombeing moved too far forward, and to hold the loop I at all times in ahorizontal position. Bods 7L, projected from and the loop pivotedeccentrieally to the pulthe lower end of the support H, extend in frontof the standard and hold the detent from moving in too far alongside thestandard. A chain, J, is secured to the arm G, and has one or more ofits links elongated and covered by a spring, J, inserted in it.

, lVhen the jack is being used for elevating pipe or rods, the chain iscaught by one of its links in hook a on the standard, and the detent isheld in the position shown, tightly binding the pipe or rod. The chainis held taut, and the spring permits a sufficient motion of the pulleyto enable same to release the rod as the latter is drawn upward.

To lower pipes or tubes the operation of the lever has been beforedescribed. The chain in this use is secured at its end to the lever, asshown in Fig. 3. i In lowering the rod the deteut mechanism is, asindicated in dotted lines Fig. 3, being forced to and held in suchposition by the weighted arm G \Vhen the rod has been lowered in themanner before described, the eler'ation of the outer end of the lever,when it reaches the position shown in Fig. 8, draws the chain taut, andthe detent mechanism, by means of the chain andthe arm G, into thefull-line position,

shown in Fig. 3, to properly retain the same while the lever is beingreturned for a fresh hold.

It will be understood that my invention will be of great utility in theraising and lowering of the pipes of oil-wells, Artesian wells, andother cases where it is desired to raise or lower long pipes or rodswhich it is difficult to properly and conveniently manipulate by hand.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is-

1. The combination of the standard, the lever pivotally supportedthereon, the pulley pivoted eccentrieally to the end of said lever,

ley, substantially as set forth..

2. The combination, with the standard and the swinging support, pivotedat its upper end to the standard, of the lever pivoted to the lower endof the swinging support, and the pulley and loop, substantially as setforth.

I11 a lifting-jack, the combination of the standard, a bracket projectedfrom the upper end thereof and provided with a guide-passage for the rodor pipe, the lever, the pulley pivoted eccentrieally to the lever, andthe loop eccentrieally secured to the pulley, substantially as setforth. p

4. The combination of the standard, the lever, grasping devices thereon,support II, pulley G,havi'ng weighted arm G loop I, and the chainconnected at one end with the pulley G, and having its other endadjustable into connection with the standard or the lever, substantiallyas set forth.

5. The combination of the standard provided with rods a a, the lever andgrasping devices thereon, the pulley G, the swinging support therefor,the loop I, and the rods 1. secured to the loop I and extended downwardbetween the rods a a, substantially as set forth.

6. The combination, with the standard, the lever, and the pulley G,provided with loop I and weighted arm G of the chain or cord J,

provided with spring J, substantially as set forth.

7. Theherein-described liftingjack, consisting of the standard, thelever, the pulley E, loop F, bracket 0, having pulley C and rod 0 thesupport H, pulley G, loop I, weighted arm G and chain J, substantiallyas set forth.

In testimony whereof I afiiX my signature in presence of two witnesses.

AUSTIN MCNALLY.

\Vitnesses:

JOHN H. KLINKNER, Janus hIOORE.

